Mechanic&#39;s square



Dec. 25,1923. I -.1,47s,soo

W. M. SLVIK- MECHANIC'S SQUARE l Filed March 11. 1922 15 Z2 J0 X19/M' Patented Dec,a 25, 1923.V

g g tarea PATENT* erstes.;-

WILLIAM M. sLAvIK, or can raanrtmnors.

, MECHANICS SQUARE.

Application led March 11, 1922. Serial No. 542,818.

vention constitutes an improvement over myl invention as set forth in Letters Patent No. 1,359,758.

A further object of the invention is the provision of selective means for rigidly lockingy the limb members of the square in extended relation with respect to each other.

Other objects will' appear hereinafter.

rl`he invention consists' in the combinations and arrangements of parts hereinafter described and claimed.

The inventionv will be best understoodby referencek to the accompanying drawings forming a part of this specification, and inwhich, l i

Fig. 1 is a plan view yof one of the sides of a square embodying the invention;

Fig. 2 is a fragmentary view of the reverse side of Fig. 1;

Fig. 3 isla fragmentary view of the square illustrated in Fig. 1 showing the same in its folded position; and

Fig. 4c is a sectional detail view, of thek same, taken substantially on line .1 -l1 of Fig. 1. y

Referring to the drawing, the preferred form of construction comprises a mechanics square A consisting of rule members 5-the tongue-and G-the stockbearing scale graduations of the usual type, said tongue 5 and stock 6 being hingedly connected to` gether, in the manner to be hereinafter set forth, and disposed substantially at right an les with respect to each other.

is best illustrated in Fig. 2 one end of the stock 6 is bevelled at an angle of 45 degrees to correspond with the adjacent bevelled edge of the tongue 5 which is also bevelled at an angle of 45 degrees. It will be noted, especially in this figure, that the width ofthe tongue 5 is greater than the width of the stock 6 and'by bevelling the l edge of the tongue 5 the bevelled edge exf tends diagonally to a point in thesame plane as the lower Ledge of the stock 6, as lillustrated at 7. This construction is such that a shoulder 8 isformedon the inner portion of the tongue 5, the edgeof which extends parallel'with respect to the adjacent edge 9 of the stock 6 and serves torelieve theV hinge member, to be hereinafter set forth, of unnecessary stress and atthe same time serves to increasey the rigidity at the junction of -the rule members.

The means vforhingedly connecting the rule members together comprises a plate 10 secured to the stock 6 adjacent the bevelled edge of the same and a plate 11 secured'to `the tongue 5 adjacent the bevelled edge v thereof, said plates havingcooperating lateral ears 12 and 13 formed thereon. The

lateral ears 12 and 13 are hingedlyconnected A together by a transverse pin 14 having its opposite ends 15 inthe form ofa rivetl head to prevent the pin from becoming# displaced.

Means is provided to rigidly lock the rule members 5 and 6 in extende'l relation with respect to each other. this means comprises a frictionally held lock member 16 which is pivotally `mounted on the tongue 5 as'at 17 said point of pivotal connection being an appreciable distance from the transverse pin 14, there'being a handleforv finger piece 18 formed on the lock plate 16 to facilitate a pivotal movement of thesame. When locking the rule members 5 and in extended relation with respect toeach other, the end portion 19 of the iock member'16 is provided with a bevelled exposed surface, the thinnest portion being at 20 the innermost end of the "lock member. rlhe principal object of this constructionis lsuch that when the vlock member 16 is pivot-ed to move into engagement with the transverse pin 14 and the adjacent surfaces of the plate members 10 and y11, the same will be wedged therebetween, thus not only serving to loclr the rule members in f such rigid extended relation but will prevent the lock member from accidentally be-V coming disengaged from the transverse pin 14 when the square is in use.

From the foregoing description of the invention it will be especially noticed that I not only provide a square which can be folded and conveniently arranged in a tool box, but I also provide a lock member which not only serves to loclr the rule members of the square in rigid extended. relatQIl with respect to each other, but will` remain in such locked position until manually disengaged from the transverse pin, this feature being accomplished through the medium of the bevelled exposed surface of the lock member and the improvements of a device as herein set forth will be found to constitute a value reater than most devices of this character.

While I have illustrated and described the preferred form of construction for carrying my invention into effect, this is capable of variation and modification` without departing from the spirit of the invention. I, therefore, do not wishto be limited to the precise details of the construction set forth, but desire to avail myself of such variations and modifications as come within the scope of the appended claims.

Having described my invention, what I claim as new and desire tosecure by Let'- ters Patent. is.:

1f.y AY foldable rule including rule .members, a hinge connection between said rule members, and lockingv means including a member pivotally carried by one of the members ofA the: hinge: connection and having a portionA extending over the other member lof thev hinge connection when the rule members `are in extended position.

2. A device of the class described com prising rule members disposed substantially at right angles with respect to each other and hingedly connected together; a pivotally mounted lock member adapted to be mounted` adjacent the connection of said rule members and adaptedto frictionally engage the pintle yof the hinge connection locking saidv membersr in rigid extended relation with respect to each other; and an operating lhandle on said lock member.

3. A foldablefrule includingrule members, a hinge connection` between said members, and locking means including a wedge shaped member pivotally carried by one of the members of the hinge connection and having a portion extending yover the other member of the hinge connection when the rulemembers are in extended position, said portion being' adapted to pass under the pintle ofthe hinge connection.

4. A device of the class described comprising rule members disposed substantially at right angles with respect to each other and hingedly connected together; a pivotally mounted lock member adapted to be mounted adjacent the connection of said rule members and having a tapered portion adapted to be wedged between the pintle of said hinge connection and the adjacent sides of the hinge members of saidY connection; and an operating handle on said lock member.

5. A device of the class described comprising rule members disp'osedsubsta-ntially at right angles with respect to each other and vhingedly connected together; a llock member pivotally mounted on one4 of said rule members adapted `to pass between the pintle of said hinge connection and the adjacent sides of the. members of saidhinge; connection, the

inner endy portion of vsaid lock member being `between said pintle and said hinge members; `a shouldery formed on one of said rule members extending parallel with and engaging the adjacent side edge of the other of said members; and an operating handle on said lock member.`

In testimony whereof I. have signed my name to 'this' specilication in thev presence of two subscribing witnesses.

IVILLIAM M.. SLAVIK.

Witnesses:

Fianna C. Arrnnron, JOSHUA R. H. Po'r'rs. 

